Speed-governor.



W. A. DOBLE.

SPEED GOVERNOR. APPLICATION FILED JUNE 2. 1913.

Patented July 31, 1917.

3 SHEETSSHEET 1 W. A. DOBLE.

SPEED GOVERNOR.

APPLICATION man JUNE 2.1913.

BM 7 r /7 W. A. DOBLE.

SPEED GOVERNOR.

APPLICATION FILED xumz 2,1913.

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UNITED STATES PATENT OFFICE.

WILLIAM A. DOBLE, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR TO THE FELTONWATER WHEEL COMPANY, OF SAN FRANCISCO, CALIFORNIA, A CORPORATION OFCALIFORNIA.

SPEED-GOVERNOR.

Specification of Letters Patent.

Patented July 31, 1917.

Application filed June 2, 1913. Serial No. 771,308.

To all whom it may concern:

Be it known that I, WILLIAM A. DOBLE, a citizen of the United States,residing at San Francisco, county of San Francisco, State of California,have invented certain new and useful Improvements in Speed- Governors,of which the following is a specification.

This invention relates to improvements in speed cont-rolling apparatusfor motors and more particularly to that class of speed controllingapparatus which is adapted for use in connection with water wheels usedfor driving electric generators.

The invention belongs to that type of speed controlling apparatus inwhich the speed responsive 0r governing element controls the gate, orother device for regulating the supply of motive energy, by means of arelay mechanism.

One of the objects of the invention is to 7 provide a mechanism of thisclass in which the gate or analogous device is moved by fluid pressuremeans and the controlling or pilot valve for the fluid pressure means ismoved in definite relation to the gate so that for every position of thegate there is a corresponding position for the pilot valve.

Another object is to provide an improved form of pilot valve providedwith means for limiting the rapidity of the movements of the pilot valveso as to avoid sudden changes in the position of the gate. I

Another object of the invention is to provide an improved form of pilotvalve which is arranged to automatically close the gate whenever thebelt by which the governor is driven breaks or slips oi? the pulley.

Another object is to provide, in connection with the automaticallyoperatlng apparatus. means whereby the gate may be operated manually.

Another object is to provide a speed controlling ap aratus having ananti-racing device whic is so constructed that the movement. of thegate, due to a given change in the speed of the motor. varies accordingto the load on the motor or the gate opening. In speed controllingapparatus as heretofore constructed anti-racing devices have 4 underfull load. The quantity of water flowing through the gate of a waterwheel controlled by an apparatus of this type has been heretofore madetochange proportionally to the speed of the water wheel at all loads,and to suit full load conditions. If the water wheel. runs under smallload, then the gate changes caused by the governor by speed variationswill be too large and a racing of the water wheel will occur. In myinvention the apparatus is so constructed that the gate change issmaller for a small load than for a full load.

Another object of the invention is to provide an improved means forconnecting the gate and the pilot valve, whereby movements of the gateare transmitted to the pilot valve. It has been found difiicult in mostcases, where speed controlling apparatus is used to-place the speedresponsive element close to the part from which it is operated and atthe same time have the servo-motor in the proper position to operate thegate. In order to obtain the best'results it is therefore necessary toseparate the speed responsive element from the servomotor and providesuitable connecting means between the two. By this arrangement the speedresponsive element may be placed close to the shaft from which it isdriven and the servo-motor may be located in the properposition tooperate the gate in which large power units, must necessarily be had aconsiderable distance from the speed responsive element. In connectingthe servo-motor with the speed responsive device cranks and long shaftsare undesirable to use on account of'possible lost motion which would bedetrimental to the correct action of the apparatus. Long belts are alsoundesirable because of the pulsations which they produce due to theflapping of the bolts and in the case of an inertia governor belts couldnot be used at all. In carrying out my invention the servo-motor isconnected with the pilot valve, which is operated by the speedresponsive element in such a manner that the movements of the gate aretransmitted to the valve by means of balls which are arranged in a tube,the balls acting in substantially the same manner as would a liquidunder similar circumstances with the exception that by the use of theballs the disadvantages which would arise from leakage of a liquid areavoided.

Other ob'ects and the various features of novelty will be apparent fromthe following description taken in connection with the accompanyingdrawings, in which:

Figure 1 is a longitudinal section through a water wheel nozzle and theapparatus for controlling the flow through the nozzle.

Fig. 2 is an end elevation of Fig. 1 with certain parts shown in sectionon the line 2--2 of Fig. 1.

Fig. 3 is a longitudinal section through a modified form of pilot valve.

Figs. 4 and 5 are fragmentary sectional views showing the pilot valve indifferent positions from that shown in Fig. 3.

Fig. 6 is a longitudinal section through another form of speedcontrolling apparatus.

Referring to Fig. 1 the numeral 30 indicates the nozzle of a water wheelwhich is controlled by a needle valve or gate 31. The nozzle may besupplied with water by means of the nozzle body 32 which may beconnected with a suitable conduit by means of the flange 33. Rearwardlyof the nozzle 30 the nozzle body 32 is provided with a chamber 34 inwhich is arranged a piston or plunger 35 which isconnected with theneedle valve 31 by means of the stem 36. A port 37 connects the waterpassage in the nozzle body 32 with the chamber 34 at the rear of theplunger 35. An entrance tube 38 is arranged in the water passage in thenozzle body 32 and supplies the port 37. This entrance tube has itsouter end arranged preferably at the center passage through the nozzlebody where the water contains less grit and other impurities and is cutofi at an angle and has its open side faced upstream or away from thenozzle to facilitate the flow of water to the cham ber 34 and to makeuse of the velocity of the inflowing water for pressure in the tube. Asuitable valve 39 controls the flow of water through the port 37.

Secured to the nozzle body at the rear of the chamber 34 is a casting 40on which is mounted the valve casing 41. Supported on the casing 41 is asuitable bracket 42 which carries the governor. The governor may be ofany suitable construction but preferably comprises a pair of centrifugalweights 43 secured to suitable springs 44. The lower ends of the springs44 may be secured to the member 45 which is rotatably mounted on asleeve 46 carried by the bracket 42. The upper ends of the springs 44may be secured .to a member 47 which is rotatably and s'lidably mountedon the sleeve 7 46. A'rod48 is arranged within the sleeve 46 and has itsupper end connected with the member 47 in such a way that this membermay rotatewith respect to the rod, but will move the rod up and down inthe sleeve 46.

The bracket 42 is provided with a bearing 49, in which is arranged ashaft 50. This shaft carries a pulley 51 which may be driven from theshaft of the motor by means of a belt. The shaft 50 also carries a bevelgear 52 which meshes with a corresponding gear 53 rigidly connected withthe member 45.

Arranged in a suitable chamber in ,the'

ber 34 with a passage 64 surrounding thev valve 54 adjacent the ports55. A valve 65 is provided for the purpose of closing the port 62 andpreventing water from flowing from the chamber 34 to the passage 64.

A pilot valve 66 is arranged in the casing 41 and surrounds the upperend of the valve 54. The pilot valve is in the form of acylindrical cupwhich closely fits the upper end of the valve 54 and is connected withthe rod 48. The pilot valve 66 is provided with restricted openings 67through its side wall which permit water to pass to and from theinterior of the valve and thus provide a dash pot device for preventingsudden movements of the valve. The valve 66 is moved by the governor toopen and close the ports 56 in the valve 54.

A stem 68 is secured to the plunger 35- and extends through a suitablestufling box in the casting 40, and has its outer end screw threaded. asindicated at 69. In the upper side of the rod 68 is an inclined groove70, in which is arranged the lower edge of the wheel 59. Springs 71 aresecured to a bracket 72 carried by the casting 40 and bear on the upperside of the pin 60 and press the wheel 59 into the groove 70. The outerend of the bracket 72 is recessed as indicated at 73 to receive theextension 74 on the hub of the hand wheel 75. The hand wheel 75 hasscrew threaded engagement with the outer end of the rod 68, whereby theneedle, valve 31 may be moved by tuming the hand wheel.

The operation is as follows:

The wheel 51 being driven from the motor shaft will revolve at aspeeddirectly proportionable to said shaft and the rotation of the wheel willbe transmitted tothe member 45, the centrifugal weights 43 and themember 47. The centrifugal force on the weights 43 will cause them tomove outwardly and draw the member 47 downward and since the pilot valve66 is directly connected with the member 47 by means of the rod 48 thepivot valve will move up and down in unison with the member 47.

Assuming that the needle valve and the valve are closed and the valve 39open it will be seen that pressure on the opposite sides of the plunger35 will be substantially equal and the pressure on the needle will holdthe latter in closed position. If the valve 65 is now opened water fromthe chamber 34 will passthrough the ports 62 and 63 and the chamber 64'in the casting 40 and through the ports 55 and 56 of the valve 54 intothe interior of the casing 41. From the latter the water will bedischarged through a suitable port 76 and a waste pipe 77. If the waterflowing through the port 37 is so throttled by the valve 39 that it willnot supply the chamber 34 as rapidly as water is flowing from thelatter, the pressure in the chamber 34 will be reduced and if thedifference in the pressure on the two sides of the plunger 35 is greaterthan the force with which the needle 31 is pressed to its seat the valve31 will be moved to the right and water will be permitted to flowthrough the nozzle against the wheel. This will start the wheel and asit increases in speed the centrifugal weights 43 will move outwardly andslide the pilot valve 66 downwardly. As the needle 31 moves toward theright the piston valve 54 is lifted by the inclined groove 70. The pilotvalve 66 and the valve 54 are thus moved toward each other, and theports 56 in the piston valve are gradually covered by the pivot valve.As the ports 56 are covered the flow therethrough is restricted and thepressure in the chamber 34 is increased to a oint where the loads on theopposite sides 0% the plunger 35 equalize and the needle valve comes torest. The parts will remain in this position so long as the speed of themotor remains constant, the flow of water from the chamber 34 throughthe ports 56- in the valve 54 being just sufl'icient to maintain theproper pres.- sure in the chamber 34 to counterbalance the pressure onthe opposite side of the plunger. If the motor increases in speed forany reason the centrifugal weights 43 will move the pilot valve 66downwardly and further restrict the flow through the ports 56. This willcause an increas in pressure in the chamber34 and move the needle valve31 toward the closed position until the flow through the nozzle is justsufficient to maintain the normal speed. As the needle valve moves thevalve 54 will be lowered until the flow through the ports 56 issufiicient to again reduce-the pressure to a point where the loads onthe opposite sides of the plunger 35 are equalized. The needle valve 31will then come to rest.

It will thus be seen that, for every position of the pilot valve, thereis a definite position of the 'needle valve. If, by a change of speed,the centrifugal weights change their position and move the pilot valvethe needle valve will follow to its corresponding position accordingly.7

To close the needle valve 31 and stop the wheel the valve 65 is closed.This will cause the pressures on the opposite sides of the chamber toequalize and permit the pressure on the needle valve to close thelatter.

From Fig. 2 it will be observed that the port 76 is above the ports 67in the pilot valve and therefore the level of the water in the casing 41will always be above the port 67, and therefore maintain the chamberwithin the pilot valve full of water so that the movements of the pilotvalve will be dampened and regulated by the flow through the ports 67.

To operate the needle valve by hand, in case the governor is out oforder, the hand wheel 75 is used. In turning the hand wheel in onedirection, the needle valve can be pulled from its seat and when thehand wheel is turned in the opposite direction the water pressure in thenozzle will move the needle toward the seat in accordance with themovements of the hand wheel.

The extension 74 of the hand wheel hub is of greater length than thestroke of the needle valve 31. This elongated hub is arranged to slidefreely in the recess 73, so that when the hand wheel is placed in theposition shown in the drawings at the extreme end of its travel where itabuts the nut at the outer end of the rod 68, any movement of the needlevalve causes the hand wheel to travel back and forth with the rod 68 andas long as the hand wheel is maintained in the position shown withrespect to the rod 68 it has no influence whatsoever on the position ofthe needle valve. When the hand wheel is rotated, however, it screwsforward on the rod 68 and prevents the needle valve from completelyclosing. and in this -wa v the needle valve can be opened and held openindependent of the action of the governor.

In Figs. 3,4 and 5 I have shown a modified form of pilot valve which maybe used in place of the valve shown in Figs. 1 and 2.

In addition to the functions performed by the pilot valve shown in Figs.1 and 2 the valve shown in Figs. 3, 4 and 5 acts as a safety device forstopping the motor in case the governor belt breaks or slips off one ofits pulleys. 'This valve is arranged in a casing 80 which may be securedto any convenient suppoit 81. The casing is provided with an inlet port82 having the same function as the port 63 in Fig. 1. Arranged in thecasing 80 is a piston valve 83 which may be identical in constructionwith the valve 54 of Fig. 1. The valve 83 is provided with the inletports 84 adjacent the annular passage 85 in the casing 80, this passagebeing in Communication with the port 82 and being similar to the passage64 shown in Fig. 1. The valve 83 is also provided with the outlet ports86 through which the water passes from the interior of the valve intothe chamber 87. This chamber is provided with an outlet port 88 whichcommunicates with an outlet passage 89, this construction beingidentical with that shown in Fig. 2. The pilot valve 90 is arranged toslide on the upper part of the piston valve in the same manner as thepilot valve 66 shown in Fig. 1 and is provided with the ports 91 whichpermit water to flow to and from the interior of the pilot valve andthus acting as a dash pot to retard the movements of the valve. Thevalve 90 is connected with a suitable actuating rod 92 which correspondsto the rod 48. The valve 90 differs from the valve 66 in that it isprovided with the ports 93 which are arranged a short distance above thelower edge of the valve and which are adapted to register with the ports86 to permit water to flow from the interior of the valve 83 into thechamber 87. position of the pilot valve with respect to the piston valve83 is such that the ports 86 are closed. this being the normal posi tionof the valves when the governor is not in operation. When the governoris rotated the rod 92 and the valve 90 will be moved downwardly and theports 93 brought into registration with the ports 86, as shown in Fig.4, this being the normal running position of the valve. In case themotor speeds up the pilot valve will be moved to a lower position andfurther restrict or shut off entirely the flow through the ports 86, asshown in Fig. 5. This will effect a rise in pressure in the chamber 34and move the needle valve 31 toward the closed position, which willthereby reduce the speed of the motor and permit the valves to assumethe position shown in Fig. 4. If the belt which drives the governorpulley 51 should break or slip off the governor would stop rotating andthe pilot valve would be drawn upwardly to the position shown in Fig. 31n As shown in Fig. 3 the which position the ports 86 are completelyclosed. This would cause the pressure in the chamber 34 to rise and movethe valve 31 to the closed position and thereby stop the motor.

From the above it will be seen that the pilot valve shown in Fig. 3 willnormally operate in exactly the same manneras the valve shown in Figs. 1and 2 and in addition provides an extremely simple and effective meansfor shutting down the motor whenever the governor belt breaks or slipsofi one of its pulleys.

In starting the motor when the pilot valve shown in Fig. 3 is used, itis necessary, after the valve 65 is opened, to use the hand 30 wheel 75to open the needle valve 31 to a point where the motor has assumedsuflicient speed to cause the pilot valve 90 to uncover the ports 86.lVhen the ports 86 are uncovered the reduction in pressure in thechamber 34 will cause the valve 31 to be further opened and permit thegovernor thereafter to fully control the movements of the valve.

In Fig. 6-1 have illustrated a speed controlling mechanism of thegeneral type shown in Figs. 1 and .2, which is suitable for controllingthe speed of any kind of motor. In the mechanism shown in Figs. 1 and 2the pressure of the water in the nozzle is used formoving the valve inone direction, the pressure in the chamber 34 being used to move thevalve .in the other direction. In the mechanism shown in Fig. 6 I haveprovided a double-acting hydraulically operated servo-motor which mayutilize as operating fluid any suitable liquid under pressure.

In this mechanism I have provided'two cylinders 95 and 96, the cylinder96 being 105 considerably larger than the cylinder 95. The cylinder 95isprovided with a suitable piston 97 and the cylinder 96 is providedwith a piston 98, these pistons being connected by a rod 99 havingsecured thereto a suitable bracket or cross head 100 which may beconnected with the device for controlling the supply of motive energy tothe motor controlled. The rod 99 has an extension 101 which projectsthrough the head 102 of'the' cylinder 96 and is provided with thescrewthreaded portion 103 exteriorly of the head. A hand wheel 104engages the threaded portion 103 of the rod 101 and has its hub pro-vvided with an extension 105 which is arranged in a guide 106' secured tothe head 102. The outer end of the rod 101 is provided with a suitablenut or abutment 107 which limits the outward movement of the hand wheel104. The cylinders 95 and 96 are of the single-acting type and arepreferably arranged in axial alinement. The cylinder 95 is provided witha head 108 and a suitable supply port 109 communicates with the spacebetween the head 108 and the piston 97. The supply port 109 may beconveniently arranged in the head 108 and communicates with a suitablesupply pipe 110.

A. supply port 111 controlled by a valve 112 communicates with the spacebetween the head 102 and the piston 98 of the cylinder 96. The port 111may be conveniently arranged in the head 102 and has connected therewitha. supply pipe 113. A port 114 preferably arranged in the head 102communicates with the interior of the pilot valve casing 115 by means ofa suitable pipe 116 in which may be arranged a stop valve 117 of anypreferred construction.

The cylinders 95 and 96 may have integrally formed therewith aconnecting table or bracket 118 on which the pilot valve casing 115 maybe mounted. The pilot valve is preferably of the type shown in Figs. 1and 2 and is controlled by a governor in the manner shown in Figs. 1 and2. Whenever desired the valve construction shown in Fig. 3 may be used.The piston valve 119 carries a cam roller 120 which may be arranged inan inclined groove 121 in the cross head 100. The table 18 may havesecured thereto springs 122 similar to the springs 71 shown in Fig. 1,these springs bearing on the pin 123 on which the roller 120 is mounted,and tending to hold the roller 120 against the inclined surface of thegroove 121. The valve 119 is provided with the ports 124 and 125 and apilot valve 126, this arrangement being identical with that shown inFig. 1. The chamber 115 is provided with a discharge port 127 whichcommunicates with a waste pipe 128.

In operation the pipes 110 and 113 are connected with a common source ofliquid under pressure. The pressure always acts on the piston 97 andtends to move the piston and the parts connected therewith in thedirection of the arrow marked open. The pressure also acts on the piston98, and since this piston is of much larger area than the piston 97 theload on the former will overbalance the load on the latter and move thepistons with the cross head 100 in the direction of the arrow markedshut and shut off the supply of motive energy to the motor controlled.When the valve 117 is open the liquid will flow from the cylinder 96through the port 114, pipe 116 and the ports in the valve 119 tothewaste pipe 128. By means oi the valve 112 the supply of liquid to thecylinder 96 may be restricted so that, on account of the discharge ofthe liquid from the cylinder 96, the pressure in this ,cylinder will bereduced to a point where the force acting on the piston 98 is equal toor lower than the force acting on the piston 97. If the two forces areeqr al the parts will remain stationary, but if the force acting on thepiston 98 is less than that acting on the piston 97 the pistons will bemoved toward the right in Fig. 6 and open the-device which supplies themotive energy to the motor. This will cause the motor to start and sincethe governor which controls tlie'pilot valve 126 will be driven by themotor the pilot valve will be lowered as the motor increases in speedand the discharge through the ports 125 gradually restricted and thuscausethe pressure in the cylinder 96 to increase'to a point where theforce acting on the piston 98 exactly counterbalances the force actingon the piston 97. This will bring the pistons to rest with the supplydevice for the motor in open position and if this position is suitablefor maintaining the motor at normal speed the parts will remain in thisposition.

When the motor changes in speed for any reason the pilot valve will beraised or lowered and open or close the controlling device for themotor, as may be necessary, in the manner fully described in connectionwith the mechanism shown in Fig. 1.

By means of the hand wheel 104 the motor may be manually controlledindependent of the governor in the same manner as described inconnection with the mechanism shown in Fig. 1

.From the above it will be seen that the mechanism shown in Fig. 6operates in the same manner as the mechanism shown in Fig. 1 and it willbe understood that the valves 112 and 117 are in all respects theequivalents of the valves 39 and respectively.

is claimed as new is:

1. In a speed controlling mechanism, the combination of a controllingelement, fluid pressure means for actuating said element, speedresponsive means, a p lot valve actuated by said speed responsive means,a mem her having a cam surface and arranged to be moved with saidcontrolling element, and a valve actuated by said cam surface andcooperating with said pilot valve to control said fluid pressure means.a

2. In a speed responsive mechanism, the combination of a controllingelement, fluid pressure means for actuating said control ling element,speed responsive means, a pilot valve adapted to be actuated by saidspeed responsive means, a member having a cam surface and arranged to beactuated by said fluid pressure means, a valve cooperating with saidpilot valve to control said fluid pressure means, means whereby saidvalve is moved in one direction by said cam surface, and spring meansfor moving said valve in the other direction.

3. In a speed controlling mechanism, the combination of a controllingvalve, a piston connected with said valve and adapted to I actuate thesame, means whereby a substantially uniform fluid pressure is maintainedon one sideof said piston, means for sup plying fluid pressure to theopposite side of said pistpn, speed responsive means, means fordischarging fluid from said 0pposite side of said piston, and valvescontrolled by said speed responsive means and the movements of, saidcontrolling valve whereby the pressure on said opposite side of saidpiston may be varied for the purpose of movlng said controlling Valve.

4:. In a speed controlling mechanism, the combination of a controllingvalve, a piston connected with said valve and adapted to have one sidethereof subjected to the pressure of the fluid passing through saidvalve,

a chamber on the opposite side of said piston, means'for supplyingpressure fluid to said chamber, means for discharging pressure fluidfrom said chamber, a manually operable valve for controlling said means,a valve adapted to be moved with said con trolling valve, speedresponsive means, and a valve adapted to be actuated by said speedresponsive means and co'ciperating with said second-mentioned valve forcontrolling the discharge of fluid from said chamber.

5. In a speed controlling mechanism, the combination of a controllingvalve, a piston connected with the controlling valve and adapted to haveone side thereof subjected to the pressure of the fluid passing throughsaid valve, a chamber on the opposite side of said piston, means for suplying fluid pressure to said chamber, a rod adapted to be moved withsaid. controlling valve and having a cam surface thereon, a pasage fordischarging fluid from said chamber, a manually operable valve forcontrolling said passage, a valve in said passage and adapted to beactuated by said cam surface, speed responsive means and a ilot valveadapted to be actuated bysaid speed responsive means and coiiperatingwith said last-mentioned valve to control the discharge of fluid fromsaid chamber.

6. In a speed controlling mechanism, the

' municationvwith said passage, means whereby said sleeve v'alve ismoved by said cam surface in accordance with the movements of saidcontrolling valve, speed responsive means and a' pilot valve actuated.by said speed responsive means and cotiperating with said sleeve valveto control the discharge of fluid through said passage.

7. In a speed controlling mechanism, the combination of a controllingvalve, a piston connected with said valve and having one side thereofsubjected to a substantially constant fluid pressure, a chamber at theopposite side of said piston, means for supplying fluid pressure to saidchamber, a rod connected with said piston and havin a cam surfacethereon, a passage for disglarging fluid from said chamber, a sleevevalve arranged in said passage, means whereby said sleeve valve isactuated by said cam s'urface, speed responsive means, and a pilot valveslidable on the exterior of said sleeve valve and coiiperatin with thelatter to control the discharge 0% fluid through said passage.

8.In a speed controlling mechanism, the

combination of a controlling valve, a piston 1 connected with said valveand having one side thereof adapted to be subjected to a substantiallyconstant fluid pressure, a chamher at the other side of said piston,means for supplying fluid pressure to said chamber, a passage fordischarging fluid from said chamber, a sleeve valve having the interiorthereof in communication with said passage and provided with a wall atone end thereof, means for moving said sleeve valve in 'accordance withthe movements of said controlling valve, speed responsive means, and apilot valve adapted to be actuated by said speed responsive means andcotiperating with said sleeve valve to control the discharge of fluidthrough said passage and to retard the movements of said speedresponsive means.

9. In a speed controlling mechanism, the combination of a controllingvalve, a piston connected with said valve and adapted to have one sidethereof subjected to a substantially constant fluid pressure, a chamberat the other sideof said piston, means for supplying fluid pressure tosaid chamber, a passage for discharging fluid from said chamber, a rodadapted to be moved with said controlling valve and having a cam surfacethereon, a sleeve valve having the interior thereof in communicationwith said passage and provided with an end wall, means whereby saidsleeve valve is moved by said cam surface, speed responsive means, apilot valve adapted to be actuated by said speed responsive means andcoiiperating with said speedvalve to control the discharge of fluidthrough said (passage and to retard the movements of em speed responsivemeans, and

manually operable valves adapted to control the flow of pressure fluidto and from said chamber.

10. In a speed controlling mechanism, the combination of a controllingvalve, a piston through said sleeve. a

connected with said valve and adapted to.

have one side thereof subjected to a substantially constant fluidpressure, a chamber at the other side of saidpiston, means forsupplyingfluid pressure to said chamber, a passage for discharging fluid fromsaid chamber, a rod adapted to be moved with said controlling valve andhaving a cam surface thereon, a sleeve valve having the interior thereofin communication with said passage and provided with an end wall, meanswhereby said sleeve valve is moved by said cam surface, speed responsivemeans, a pilot valve adapted to be actuated by said speed responsivemeans and cooperating with said sleeve valve to control the discharge offluid through said passage and to retard the movements oi said speedresponsive means, manually operable valves adapted to control the flowof pressure fluid to and from said chamber, and a manuall operabledevice con: nected with said re and adapted to move said controllingvalve.

11. In an apparatus of the class described, the combination of acontrolling valve, fluid pressure means for moving said controllingvalve, s eed responsive means, and valve means or controlling said fluidpressure means, said valve means comprising a sleeve having portstherein whereby fluid may be discharged from said fluid pressure meanspilot valve adapted to be actuated by'said speed responsive means andslidable on the exterior of said sleeve, said pilot valve bein providedwith ports adapted to register wlth ports in said sleeve when said speedresponsive means is in operation and being also provided with meansadapted to close the ports in said sleeve when said speed responsivemeans ceases to operate.

12. In an apparatus of the class described, a controlling valve, fluidpressure means for actuating said controlling valve, speed responsivemeans, and "alve means actuated by said speed responsive means and saidfluid pressure meansfor controlling the latter and comprising a sleevehaving axially spaced ports and a valve slidable on the extenor of saidsleeve and adapted to control one of said ports, said valve having aport adapted said sleeve port when said speed responsive means is inoperation and to register with being adapted to close said sleeve portwhen said speed responsive means is out of operation. I a

13. In an apparatus of the class described, the combination of acontrolling valve, fluid pressure means for operating said valve, andmeans for controlling 'sai fluid ressure means and comprising, a tubularva ve havits wall and a tubular valve concentrically arranged withrespect to said first-men.-

, through its wall thereof and adapted to cooperate with one ing axiallyspaced ports extending through tioned valve and provided with an openingand spaced from the ends of the ports of said first-mentioned tubularvalve.

14. In an apparatus of the class described, the combination of a valve,fluid pressure means for operating said valve and valve means forcontrolling said fluid pressure means and comprising a tubular valvehaving a wall at one end thereof and -axially spaced ports, and a secondtubular valve slidable on the exterior of said first-mentioned valve andhaving an end wall adapted to cooperate with the end wall in saidfirst-mentioned tubular valve to form a closed chamber, and a portextending through said second-mentioned tubular valve and adapted toestablish communication between said chamber and the exterior of saidsecond-mentioned valve.

15. Inan apparatus of the class described, the combination of acontrolling element, fluid pressure means for operating said controllingelement, and valve means for controlling said fluid pressure means andcomprising a tubular valve having a closed end andaxially spaced ports,a cup-shaped valve concentrically arranged on the exterior of saidfirst-mentioned valve and cooperating with the end wall of the latter toform a chamber, and a port extending through the wall of said cup-shapedvalve and establishing communication between saidchamber and theexterior of said valve.

16. In an apparatus of the class described, the combination of acontrolling element, fluid pressure means for operating said element,and valve means for controlling said fluid pressure means and comprisinga casing, a plurality of chambers in said casing a tubular valve movablein said casing and having an end wall and ports establishingcommunication between the interior of said valve and said chambers, acup-shaped valve in one of said chainbers slidable on the exterior ofsaid tubular valve and cooperating with-the end wall of said tubularvalve to form a dash pot, a. port establishing communication betweentheinterior of said dash pot and the chamber in which said cupshaped valveis arranged, and an outlet ort from said chamber arranged abovevsaidfirstmentioned port whereby fluid will be maintained insaid dash pot atall times. t

17. In an apparatus of the class described, the combination of acontrolling. element, fluid pressure means for operating saidcontrolling element, and valve means for controlling said fluid pressuremeans and comprising a casing having a. plurality of chambers therein, atubular valve havmg' an end wall in one of said chambers aridjhavingports establishing communication between the interior of said valve andsaid chambers, a cup-shaped valve slidably arranged on the exterior ofsaid tubular valve and cooperating with the end Wall of the latter toform a dash pot, a port through the wallof said cup-shaped valveestablishing communication between said dash pot and the chamber inwhich said valve is arranged, and an outlet port from said chamberarmesses ranged above said last-mentioned port 10 whereby said dash potwill be supplied with fluid at all times.

In testimony whereof I aifix my signature in presence of two witnesses.

WILLIAM A. DOBLE. Witnesses:

ARTHUR L. BRYANT, Joan M. Corr.

